Summary
It is shown that θ-vacua exist in two-dimensional non-Abelian gauge theories, as well as in the Abelian theories.
Riassunto
Si mostra che esistono vuoti θ in teorie di gauge bidimensionali non abeliane, così come in teorie abeliane.
Резюме
Показывается, что θ вакуумы существуют в двумерных неабелевых калибровочных теориях, а также в абелевых теориях.
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References
J. Lowenstein andJ. Swieca:Ann. of Phys.,68, 172 (1971).
S. Coleman:Ann. of Phys.,101, 239 (1976).
A. M. Polyakov:Nucl. Phys.,121 B, 429 (1977);G. ’t Hooft:Nucl. Phys.,72 B, 461 (1974);C. Callan, R. Dashen andD. J. Gross:Phys. Lett.,63 B, 334 (1976).
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For a related discussion, seeI. Bars andM. B. Green:Phys. Rev. D,17, 537 (1978).
For analogous comments on classification of instantons and vortices, seeG. ’t Hooft:Nucl. Phys.,138 B, 1 (1978).
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Research is supported in part by the National Science Foundation under Grant No. PHY77-22864, and by the Harvard Society of Fellows.
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Witten, E. θ-vacua in two-dimensional quantum chromodynamics. Nuov Cim A 51, 325–338 (1979). https://doi.org/10.1007/BF02776593
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DOI: https://doi.org/10.1007/BF02776593